Numerical modelling of film cooling from converging slot-hole

Azzi, Abbès; Jubran, B. A.

doi:10.1007/s00231-006-0115-9

Cited by 71 publications

(27 citation statements)

References 25 publications

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“…Fig. 7 shows the typical form of secondary vortices downstream of console which is obtained by Azzi and Jubran [17] and verified by Liu et al [18]. The couple vortices also exist in the flow field of consoles with large divergence angle.…”

Section: Experimental Uncertainties and Validation Testsupporting

confidence: 53%

“…Flow visualization data demonstrated that the console film remained thin and attached to the surface for the momentum flux ratios of 1.1-40 and for a case with no crossflow because of Coanda effect. Detail flow structures of console film cooling flow field were investigated by Azzi and Jubran [17] and Liu et al [18] through numerical simulations. They found that jets from consoles formed completely different flow structures from that of cylindrical holes and expansion shaped holes.…”

Section: Introductionmentioning

confidence: 99%

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Experimental research on the thermal performance of converging slot holes with different divergence angles

Liu

Zhu

Bai

et al. 2009

Experimental Thermal and Fluid Science

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Section: Experimental Uncertainties and Validation Testsupporting

confidence: 53%

Section: Introductionmentioning

confidence: 99%

Experimental research on the thermal performance of converging slot holes with different divergence angles

Liu

Zhu

Bai

et al. 2009

Experimental Thermal and Fluid Science

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“…Many studies are available which describe film cooling effectiveness associated with various schemes of coolant injectors applicable to gas turbines. Staggered rows of compound angle holes by Jurban et al [7], converging slot holes by Azzi and Jurban [8], trenched and compound holes by Baheri et al [9], a novel sister hole configuration by Ely and Jurban [10], comparison of film-cooling hole schemes such as fan, crescent, louver, and dumbbell-shaped holes by Kim et al [11], slot with cylindrical end and slot with median cylindrical hole by Benabed [12], micro-hole by Balasubramaniyan [13] etc. are some of the important studies related to injector hole configuration.…”

Section: Literature Reviewmentioning

confidence: 98%

Effect of injector configuration in rocket nozzle film cooling

2015

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List of symbols A injCross-sectional area of the nozzle at the coolant injection point (m 2 ) A throat Cross-sectional area of the throat of the nozzle (m 2 ) AR Area ratio (dimensionless) BR Blowing ratio (dimensionless) c p Specific heat (J kg −1 K −1 ) Hz Unit of frequency (cycles per second) hp Horse power (1 hp = 746 W) J Diffusion flux (kg m −2 s −1 ) p Static pressure (N m −2 ) r Radial coordinate (mm) Re Reynolds number (dimensionless) Sc Schmidt number (dimensionless) TuTurbulence intensity (%)Mass fraction of the component (dimensionless) Greek lettersDegree of film cooling effectiveness (dimensionless) ΔT Temperature difference between surface and ambient (K) Subscripts c CoolantAbstract Experimental and numerical investigations are carried out to analyze the effect of coolant injector configuration on overall film cooling performance in a divergent section of a rocket nozzle. Two different injector orientations are investigated: (1) shaped slots with a divergence angle of 15° (semi-divergent injector) (2) fully divergent slot (fully divergent injector). A 2-dimensional, axis-symmetric, multispecies computational model using finite volume formulation has been developed and validated against the experimental data. The experiments provided a consistent set of measurements for cooling effectiveness for different blowing ratios ranging from 3.7 to 6. Results show that the semi divergent configuration leads to higher effectiveness compared to fully divergent slot at all blowing ratios. The spatially averaged effectiveness results show that the difference between the two configurations is significant at higher blowing ratios. The increase in effectiveness was around 2 % at BR = 3.7 whereas it was around 12 % in the case of BR = 6. Numerical results show the presence of secondary flow recirculation zones near the jet exit for both the injectors. An additional recirculation zone present in the case of fully divergent injector caused an increase in mixing of the coolant and mainstream, and a reduction in film cooling performance.

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“…This accelerated flow is speculated to have lower jet turbulence and higher stability. Detailed flow structures of console film cooling flow field were also investigated by Azzi and Jubran [17] and Yao et al [18] through numerical simulations. Liu et al [19,20] further investigated the effect of console geometry variants including exit-entry area ratio and divergence angle on the film cooling performance of the consoles.…”

Section: Introductionmentioning

confidence: 98%

Investigation on film cooling characteristics from a row of converging slot-holes on flat plate

Yao

Zhang

2011

Sci. China Technol. Sci.

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Experimental and numerical researches were conducted to investigate the cooling performance of a single row of consoles (converging slot-hole) on a large-scale flat-plate model. The results show that the coolant flow from a row of consoles shows good lateral uniformity of adiabatic effectiveness, with regions of slightly enhanced cooling occurring between the consoles. For the console cooling geometry, the interaction between coolant jet from inclined console and the mainstream flow results in reasonable vortices configuration. A pair of counter rotating vortices originate from the edge of slot, not from the centerline of film holes and the rotating direction is contrary to conventional cylindrical hole. The heat transfer coefficient ratio is a little bigger for the console case than conventional cylindrical hole, and the discharge coefficient for a console is larger than that for cylindrical film cooling hole. film cooling, converging slot-hole, cooling effectiveness, heat transfer coefficient, discharge coefficient Citation:

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Numerical modelling of film cooling from converging slot-hole

Cited by 71 publications

References 25 publications

Experimental research on the thermal performance of converging slot holes with different divergence angles

Experimental research on the thermal performance of converging slot holes with different divergence angles

Effect of injector configuration in rocket nozzle film cooling

Investigation on film cooling characteristics from a row of converging slot-holes on flat plate

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